Tirmidhi

Explanation:
1:
In the determination of these punishments, Allah has not acted unjustly towards anyone.
They are entirely in accordance with justice.
Allah is absolutely not unjust to His servants.
As for the matter of the mercy of Paradise, that is a matter of ninety-nine out of a hundred.

Hadith Commentary: Benefits and Issues: The attribution of Muharram to Allah Almighty is solely in consideration of its honor, virtue, and greatness, and it is one of the four sacred months. Therefore, Imam Nawawi rahimahullah holds the view that after Ramadan, the most virtuous fasts are those of the sacred months (ashhur hurum): Dhu al-Qa'dah, Dhu al-Hijjah, Muharram, and Rajab.

Some are of the opinion that what is meant here is only the fast of 'Ashura, because the Prophet sallallahu alayhi wa sallam used to fast on that day, and he sallallahu alayhi wa sallam used to fast more in Sha'ban, as in this month the annual deeds are presented before the Lord of the worlds.

If the entire month of Muharram were intended, then when its fasts are the most virtuous, the Prophet sallallahu alayhi wa sallam would have fasted in it, especially since it is also a sacred month.

The year also begins with it, and if the beginning of the year is with goodness, blessing, and righteous deeds, then there can be hope for the continuation and permanence of goodness and virtue in the remaining months of the year. The scholars have responded to this by saying that the Prophet sallallahu alayhi wa sallam came to know of the virtue of Muharram towards the end of his life, or perhaps some necessity or excuse occurred for him sallallahu alayhi wa sallam in this month.